The Extended IRAS
Galaxy Atlas

The EIGA is an extension of the original IGA to
b = 6.7° High resolution images at 60 um and 100 um
have been produced to match the latitude coverage of radio
continuum observations obtained as part of the Canadian
Galactic Plane Survey (CGPS).

Overview

The Infrared Astronomical Satellite
(IRAS) carried out a nearly
complete survey of the infrared sky, and the survey
data are important for the study of many astrophysical
phenomena. However, many data sets at other wavelengths
have higher resolutions than that of the co-added IRAS
maps, and high resolution IRAS images are strongly
desired both for their own information content and
their usefulness in correlation studies. In particular
the typical 1' resolution of the HIRES atlas images is
ideal for comparison with data from the numerous radio
surveys of the Galactic plane currently underway.

IGA images were incorporated into the Canadian Galactic
Plane Survey as a far-infrared data set to complement the
radio continuum and molecular line data. Since the IGA has
a high-latitude cutoff of b=4.7° the initial CGPS
mosaics constructed using the IGA had a blank strip at high
latitudes. In order to match the infrared coverage of the
CGPS with the radio continuum coverage a high-latitude
extension (to b = 6.7°) of the IGA was constructed
covering approximately 75° < l < 148°